/*
* Copyright 2013-2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.netflix.rx;
import java.io.IOException;
import org.springframework.http.MediaType;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitter;
import rx.Observable;
import rx.Subscriber;
import rx.Subscription;
/**
* Subscriber that emits any value produced by the {@link Observable} into the delegated {@link ResponseBodyEmitter}.
*
* @author Jakub Narloch
*/
class ResponseBodyEmitterSubscriber<T> extends Subscriber<T> implements Runnable {
private final MediaType mediaType;
private final Subscription subscription;
private final ResponseBodyEmitter responseBodyEmitter;
private boolean completed;
/**
* Creates new instance of {@link ResponseBodyEmitterSubscriber} with response media type, observable and response
* emitter.
*
* @param mediaType the marshaled object media type
* @param observable the observable
* @param responseBodyEmitter the response emitter
*/
public ResponseBodyEmitterSubscriber(MediaType mediaType, Observable<T> observable, ResponseBodyEmitter responseBodyEmitter) {
this.mediaType = mediaType;
this.responseBodyEmitter = responseBodyEmitter;
this.responseBodyEmitter.onTimeout(this);
this.responseBodyEmitter.onCompletion(this);
this.subscription = observable.subscribe(this);
}
@Override
public void onNext(T value) {
try {
if(!completed) {
responseBodyEmitter.send(value, mediaType);
}
} catch (IOException e) {
throw new RuntimeException(e.getMessage(), e);
}
}
@Override
public void onError(Throwable e) {
responseBodyEmitter.completeWithError(e);
}
@Override
public void onCompleted() {
if(!completed) {
completed = true;
responseBodyEmitter.complete();
}
}
@Override
public void run() {
subscription.unsubscribe();
}
}